lawcenter,where mark potok and his colleagues have been fighting the kkk in courtrooms and classrooms for decades. many of the klanspeople we've talked to say barack obama has been our single most effective recruiting tool in the last four, five years. >> well, i think there's some truth to that. immediately after obama was elected, we saw two of the largest hate websites in the country crash. >> reporter: potok told us that by the late '80s, the klan dwindled to a few hundred. they now number closer to 6,000. >> white power! >> reporter: he believes they can be very dangerous. >> it's dangerous, not so much because a whole bunch of klansmen get together in a room and plan to murder 1,000 people with a bomb so, you know, it's the lone wolf characters that get frustrated with their leaders that break away, you know, one day, walk out of their house and start shooting. >> reporter: with that in mind, at a gas station outside of tupelo, the grand dragon appears. he is also known as steven howard, 31 years old, he says he's an iraq war veteran. he comes with a loaded pistol

is one powerful group using a littleknownlawthatallows them to challenge the right of their fellow citizens to vo to? they say they are fighting voter fraud. critics say it is suppression. abc's dan harris set out to investigate for your voice, your vote. >> reporter: teresa sharp is a grandmother who says she's voted in every election since she was 18. she's even served as a poll worker. >> voting, to me, is like, sacred. >> reporter: so, imagine her surprise when she got this letter in the mail. >> dear mrs. sharp. you are hereby note if ied that your right to vote has been challenged by a qualified elector under rc-3503.24, whatever that is. >> reporter: her sons christopher and herbert jr. received similar letters. so his her daughters. and her elderly aunt, too. >> there's somebody out here trying to scare people into not voting. >> reporter: but who? who prompted the county government to send out these letters? the answer, a grassroots organization called true the vote. true the vote believes voter fraud is a sleeping national epidemic. these are their recruitment videos. >>